Geometry Nodes: Align Euler to Vector Node

This commit introduces the Align Euler to Vector function node which
rotates to a body into a given direction. The node replaces the legacy
"Align Rotation to Vector" node, which only worked on an attribute
named `rotation` internally. The "Euler" in the name is meant to make
it clearer that the rotation isn't interchangeable with a regular
vector.

Addresses T91374.

Differential Revision: https://developer.blender.org/D12726

1 files changed, 60 insertions, 0 deletions

diff --git a/source/blender/makesrna/intern/rna_nodetree.c b/source/blender/makesrna/intern/rna_nodetree.c
index 5e997f81753..cab420ba990 100644
--- a/source/blender/makesrna/intern/rna_nodetree.c
+++ b/source/blender/makesrna/intern/rna_nodetree.c
@@ -9952,6 +9952,66 @@ static void def_geo_align_rotation_to_vector(StructRNA *srna)
   RNA_def_property_update(prop, NC_NODE | NA_EDITED, "rna_Node_socket_update");
 }
 
+static void def_fn_align_euler_to_vector(StructRNA *srna)
+{
+  static const EnumPropertyItem axis_items[] = {
+      {FN_NODE_ALIGN_EULER_TO_VECTOR_AXIS_X,
+       "X",
+       ICON_NONE,
+       "X",
+       "Align the X axis with the vector"},
+      {FN_NODE_ALIGN_EULER_TO_VECTOR_AXIS_Y,
+       "Y",
+       ICON_NONE,
+       "Y",
+       "Align the Y axis with the vector"},
+      {FN_NODE_ALIGN_EULER_TO_VECTOR_AXIS_Z,
+       "Z",
+       ICON_NONE,
+       "Z",
+       "Align the Z axis with the vector"},
+      {0, NULL, 0, NULL, NULL},
+  };
+
+  static const EnumPropertyItem pivot_axis_items[] = {
+      {FN_NODE_ALIGN_EULER_TO_VECTOR_PIVOT_AXIS_AUTO,
+       "AUTO",
+       ICON_NONE,
+       "Auto",
+       "Automatically detect the best rotation axis to rotate towards the vector"},
+      {FN_NODE_ALIGN_EULER_TO_VECTOR_PIVOT_AXIS_X,
+       "X",
+       ICON_NONE,
+       "X",
+       "Rotate around the local X axis"},
+      {FN_NODE_ALIGN_EULER_TO_VECTOR_PIVOT_AXIS_Y,
+       "Y",
+       ICON_NONE,
+       "Y",
+       "Rotate around the local Y axis"},
+      {FN_NODE_ALIGN_EULER_TO_VECTOR_PIVOT_AXIS_Z,
+       "Z",
+       ICON_NONE,
+       "Z",
+       "Rotate around the local Z axis"},
+      {0, NULL, 0, NULL, NULL},
+  };
+
+  PropertyRNA *prop;
+
+  prop = RNA_def_property(srna, "axis", PROP_ENUM, PROP_NONE);
+  RNA_def_property_enum_sdna(prop, NULL, "custom1");
+  RNA_def_property_enum_items(prop, axis_items);
+  RNA_def_property_ui_text(prop, "Axis", "Axis to align to the vector");
+  RNA_def_property_update(prop, NC_NODE | NA_EDITED, "rna_Node_update");
+
+  prop = RNA_def_property(srna, "pivot_axis", PROP_ENUM, PROP_NONE);
+  RNA_def_property_enum_sdna(prop, NULL, "custom2");
+  RNA_def_property_enum_items(prop, pivot_axis_items);
+  RNA_def_property_ui_text(prop, "Pivot Axis", "Axis to rotate around");
+  RNA_def_property_update(prop, NC_NODE | NA_EDITED, "rna_Node_update");
+}
+
 static void def_geo_point_scale(StructRNA *srna)
 {
   PropertyRNA *prop;